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Title: Modelling the evaporation of nanoparticle suspensions from heterogeneous surfaces
Authors: Chalmers, Christopher
Smith, Roger
Archer, Andrew J.
Keywords: Evaporation
Liquids on surfaces
Wetting
Issue Date: 2017
Publisher: © IOP Publishing
Citation: CHALMERS, C., SMITH, R. and ARCHER, A.J., 2017. Modelling the evaporation of nanoparticle suspensions from heterogeneous surfaces. Journal of Physics: Condensed Matter, doi:10.1088/1361-648X/aa76fd.
Abstract: We present a kinetic Monte Carlo (KMC) grid-based model for the drying of drops of a nanoparticle suspension upon a heterogeneous surface. The model consists of a generalised lattice-gas in which the interaction parameters in the Hamiltonian can be varied to model different properties of the materials involved. We show how to choose correctly the interactions, to minimise the effects of the underlying grid so that hemispherical droplets form. We also include the effects of surface roughness to examine the effects of contact-line pinning on the dynamics. When there is a `lid' above the system, which prevents evaporation, equilibrium drops form on the surface, which we use to determine the contact angle and how it varies as the parameters of the model are changed. This enables us to relate the interaction parameters to the materials used in applications. The model has also been applied to drying on heterogeneous surfaces, in particular to the case where the suspension is deposited on a surface consisting of a pair of hydrophilic conducting metal surfaces that are either side of a band of hydrophobic insulating polymer. This situation occurs when using inkjet printing to manufacture electrical connections between the metallic parts of the surface. The process is not always without problems, since the liquid can dewet from the hydrophobic part of the surface, breaking the bridge before the drying process is complete. The KMC model reproduces the observed dewetting, allowing the parameters to be varied so that the conditions for the best connection can be established. We show that if the hydrophobic portion of the surface is located at a step below the height of the neighbouring metal, the chance of dewetting of the liquid during the drying process is significantly reduced.
Description: This paper is closed access until 12 months after publication.
Version: Accepted for publication
DOI: 10.1088/1361-648X/aa76fd
URI: https://dspace.lboro.ac.uk/2134/25393
Publisher Link: https://doi.org/10.1088/1361-648X/aa76fd
ISSN: 0953-8984
Appears in Collections:Closed Access (Maths)

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